JPH0665886B2 - Worm gear type hose clamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to cooling and intake of an engine room in an automobile,
Hose clamps for connecting metal pipes such as hoses used for fuel supply, circulation of lubricating oil, power steering, air-conditioning equipment, general water supply hoses, gas hoses, and chemical liquid injection hoses, especially worm gears. The present invention relates to a worm gear type hose clamp that is used to tighten and loosen a band.

<Prior Art> FIG. 8 is a perspective view of a conventional example of a worm gear type hose clamp used in the above-described equipment. The hose clamp includes an inner band 1 wound around an outer peripheral surface of a hose (not shown), an outer band 2 that is continuous with the inner band 1 and overlaps the band 1, and a gear formed on the outer band 2. It is composed of a worm gear 4 that meshes with the groove 3 and slides the outer band 2, and a housing 5 that rotatably supports the worm gear 4. The operation of this hose clamp is to insert a hose into the inner band 1 and rotate the worm gear 4 to slide the outer band 2 in the length direction of the band to reduce the winding diameter of the inner band. This is done by bringing the hose into close contact with the outer surface of the hose. Therefore, it is necessary to fix the end portion of the inner band 1 to which the outer band 2 is continuously provided to the housing 5 and use it as a fulcrum when tightening. Therefore, conventionally, one metal plate is processed to form the housing 5, both sides of the lower end portion of the housing 5 are bent inward, and the bent end portion 6 and the inner band 1 are welded by spot welding. is doing.

<Problems to be Solved by the Invention> However, in the conventional hose clamp, the coupling force that resists the relative twisting action of the inner band 1 and the bent end portion 6 is weak, and if the band is firmly tightened, Band 1
There is a problem in that the bending stress is applied to the bent end portion 6 and the spot welding is easily broken.

<Means for Solving the Problems> The present invention has been made in view of the problems of the above-described prior art, and an object thereof is to provide a hose clamp in which an inner band is firmly connected to a housing.

In order to achieve the above object, as a result of the inventors' consideration,
The connecting force between the inner band and the housing may be such that no large connecting force is required to the left in the direction in which the inner band is peeled off, that is, in the direction perpendicular to the inner band, and the parts do not disperse in the free state. In the direction in which the inner band is tightened, that is, in the lengthwise direction of the inner band, a strong connecting force can be easily obtained (for example, spot welding is also possible), so that the connecting force that resists the torsional stress generated during tightening described above is We obtained the finding that strengthening is an important measure, and completed the present invention based on this finding.

That is, the hose clamp according to the present invention forms a butting surface in a direction intersecting the length direction of the inner band on at least a part of both end surfaces of the housing obtained by processing one metal plate, and engages with each other. Characterized in that an engaging hole and a columnar engaging projection are formed on the housing and the inner band, and the engaging projection is crushed to fix the engaging projection to the engaging hole. .

<Operation> The torsional stress generated when the band is tightened is generated in a plane parallel to the length direction of the band (inner band), but in the present invention, the torsional stress is engaged with the abutting surface in a mutually fixed state. It is received by the columnar engagement protrusion and the engagement hole.

<Embodiment> An embodiment of the present invention will be specifically described below with reference to FIGS. 1 to 6. In the illustrated embodiment,
Since the outer band and the worm gear are the same as those in the conventional example, they are omitted, and the housing and the inner band will be described.

FIG. 1 is a front view of the housing 10, and FIGS. 2 and 3 are a side view and a bottom view thereof. The housing 10 has a single metal plate 11 bent into a loop shape by sheet metal working or the like, and has a cylindrical upper hollow portion 12 in which a worm gear is rotatably supported, and is provided continuously below the hollow portion 12. A rectangular tubular lower cavity 13 into which the end of the inner band 20 and the outer band are inserted is formed. In this case, both end surfaces 14a and 14b of the metal plate face each other at the bottom of the lower cavity portion 13, and both end surfaces 14a and 14b are parallel to the length direction of the inner band as shown in FIG. Surface and abutting surfaces 14c, 14 in a direction orthogonal to the parallel surface
It has a so-called staircase shape in which d is connected. That is, the abutting surfaces 14c and 14d intersect orthogonally to the length direction of the inner band, and the twisting stress acting in the length direction of the inner band due to the tightening of the band causes abutting surfaces 14c and 14d.
It can be received by the collision of 14d. This improves the strength against torsional stress.

In addition, columnar engagement protrusions 15a and 15b and engagement holes 21a and 21b that engage with each other are formed at the bottom of the lower cavity 13 and the end of the inner band 20. In this embodiment, the engaging protrusions 15a and 15b are formed so as to project in a cylindrical shape from the bottom of the lower cavity portion 13 of the housing 10, and the engaging holes 21a and 21b are formed as shown in FIG.
It is drilled at the end of 0. These engaging protrusions 15a,
15b and the engaging holes 21a, 21b are formed so as to have a diameter such that there is a slight clearance so as to engage with each other, but the engaging protrusions 15a, 15b have the opposite end faces 14a, 14b facing each other. Is formed at each of the two end faces, and the engaging holes 21a and 21b are formed at positions corresponding to the engaging protrusions 15a and 15b. And
Torsional stress acting on the inner band is received by fixing the engagement projections and the engagement holes by crushing the engagement projections described later between the engagement projections 15a and 15b and the engagement holes 21a and 21b, The strength of the band is further improved. Further, a strong coupling force between the inner band 20 and the housing 10 in the longitudinal direction can also be obtained by the fixed engagement between the engaging protrusion and the engaging hole.

5 and 6 are cross-sectional views showing the assembling of the engaging projections 15a, 15b and the engaging holes 21a, 21b. The engagement projections 15a and 15b are projected in advance so as to be slightly higher than the plate thickness of the inner band 20, and the engagement holes 21 of the inner band 20 are inserted into the engagement projections 15a and 15b.
a and 21b are engaged with each other. Then, the engaging protrusion 15
The upper ends of the a and 15b are crushed by caulking or the like to expand the diameter, and the height of the engaging projections 15a and 15b is made to match the plate thickness of the inner band 20 or slightly lowered. As a result, the engagement protrusions 15a and 15b and the inner band 20 are firmly fixed to each other so as to withstand a light load, and the upper surfaces of the engagement protrusions 15a and 15b are the same as or slightly lower than the inner band 20. The outer band slides smoothly.
The engagement protrusions 15a, 15b and the inner band 20 are fixed to each other in the direction in which the inner band 20 is separated from the housing, that is, in the direction perpendicular to the inner band 20, and the load applied in this direction is small, so that It can withstand crushing.

In this embodiment as described above, the torsional stress generated by the tightening of the band is received by the fixed engagement between the engaging hole and the engaging protrusion, so that the strength is large and the inner band is not separated from the housing.

Various modifications can be made in the present invention. For example, a columnar engagement protrusion may be formed at the end of the inner band, and the engagement hole may be formed at the bottom of the housing. Further, these shapes are not limited to those shown in the figures, and may be rectangular or elliptical, and the number thereof may be changed. Then, the engaging protrusion is
As shown in the figure, it may be formed by the dowel projection 15c. Furthermore, if the abutting surface is formed in a part of the metal plate in a direction intersecting the lengthwise direction of the inner band, the intended purpose can be achieved, and for example, the "U" shape, the "U" shape, the " It may be an "S" shape, or an inclined surface having a predetermined angle, etc., and it may be a "V" shape over the entire end surfaces of the metal plate.
The butt surface may be formed by an "S" shape or a single inclined surface having a predetermined angle.

As described above, according to the present invention, the columnar engagement protrusion is crushed so that the engagement protrusion is fixed to the engagement hole. Therefore, the diameter of the crushed engagement protrusion is increased. There is no gap with the engaging hole along the circumference, and since the abutting surfaces are also formed on both end surfaces of the housing formed by bending the metal plate, the strength against torsional stress during worm gear operation is greatly improved. In addition, a firm and reliable tightening operation can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a housing used in an embodiment of the present invention, FIGS. 2 and 3 are side views and bottom views thereof,
FIG. 4 is a perspective view of the end of the inner band on the inner side, FIGS. 5 to 7 are sectional views showing the assembling order, and FIG. 8 is a perspective view of a conventional example. 1, 20 ... Inner band, 2 ... Outer band, 4 ... Worm gear, 5, 10 ... Housing, 12 ... Upper cavity part, 13 ... Lower cavity part, 14a, 14b ... Both end surfaces of metal plate, 14c, 14d ... Butt surface , 15a, 15b, 15c ... Engaging projections, 21a, 21b ... Engaging holes

Claims (3)

[Claims] 1. An upper cavity for rotatably supporting a worm gear, wherein a housing is bent in a loop so that both end faces of one metal plate are opposed to each other, and both end faces of the upper cavity are continuous with the cavity. And a lower cavity having an opposed portion located at the bottom, and at least a part of the both end surfaces has a butting surface in a direction intersecting the length direction of the inner band and engages with each other. Engagement holes and columnar engagement protrusions are formed in the bottom portion of the lower cavity and the inner band, and the engagement protrusions are crushed to secure the engagement protrusions to the engagement holes. Worm gear type hose clamp characterized by having. 2. The worm gear type hose clamp according to claim 1, wherein the abutting surface is formed on a part of both end surfaces of the metal plate so as to be orthogonal to the longitudinal direction of the inner band. 3. A worm gear type hose clamp according to claim 1, wherein the engagement hole is formed in an inner band, and the engagement projection is formed in a housing.